Data encryption module?

In exploring #147 , I noticed that the content that google was caching has actually disappeared from LU (likely intentionally) -- but as we used to have a Deepening on truecrypt, I don't see any coverage of hard drive / container encryption in the new site: https://web-beta.archive.org/web/20160430081721/https://www.level-up.cc/leading-trainings/training-curriculum/deepening/truecrypt .  